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	ttimer.c - stopwatch - simple timer for console or x root window
	git clone git://src.adamsgaard.dk/stopwatch
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	ttimer.c (2241B)
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	1 #include <stdio.h>
	2 #include <stdlib.h>
	3 #include <limits.h>
	4 #include <unistd.h>
	5 #include <time.h>
	6 #include <string.h>
	7 #include <err.h>
	8 #include <X11/Xlib.h>
	9
	10 #include "timeutil.h"
	11
	12 char *argv0;
	13
	14 void
	15 usage(void)
	16 {
	17 errx(1, "usage: %s [-p prefix] [-P postfix] [-i interval] [-x] H…
	18 }
	19
	20 void
	21 print_loop(unsigned int interval, char prefix, char postfix, time_t du…
	22 {
	23 char buf[LINE_MAX];
	24 time_t t_start = time(NULL);
	25 time_t t_elapsed = 0;
	26
	27 while ((t_elapsed = time(NULL) - t_start) < duration) {
	28 format_time(buf, sizeof(buf), duration - t_elapsed, pref…
	29 printf("\r%s ", buf);
	30 fflush(stdout);
	31 sleep(interval);
	32 }
	33 printf("\a\n");
	34 }
	35
	36 void
	37 xroot_loop(unsigned int interval, char prefix, char postfix, time_t du…
	38 {
	39 Display *dpy;
	40 char buf[LINE_MAX];
	41 time_t t_start = time(NULL);
	42 time_t t_elapsed = 0;
	43
	44 dpy = XOpenDisplay(NULL);
	45 if (dpy == NULL)
	46 errx(1, "cannot open display");
	47 while ((t_elapsed = time(NULL) - t_start) < duration) {
	48 format_time(buf, sizeof(buf), duration - t_elapsed, pref…
	49 XStoreName(dpy, DefaultRootWindow(dpy), buf);
	50 XSync(dpy, False);
	51 sleep(interval);
	52 }
	53 snprintf(buf, sizeof(buf), "%sEND%s", prefix, postfix);
	54 XStoreName(dpy, DefaultRootWindow(dpy), buf);
	55 XSync(dpy, False);
	56 }
	57
	58 int
	59 main(int argc, char *argv[])
	60 {
	61 int h, m, s;
	62 time_t duration;
	63 int ch, xflag = 0;
	64 unsigned int interval = 1;
	65 char prefix[LINE_MAX] = "", postfix[LINE_MAX] = "";
	66 const char *errstr;
	67
	68 argv0 = *argv;
	69
	70 while ((ch = getopt(argc, argv, "p:P:i:x")) != -1) {
	71 switch (ch) {
	72 case 'p':
	73 strlcpy(prefix, optarg, sizeof(prefix));
	74 break;
	75 case 'P':
	76 strlcpy(postfix, optarg, sizeof(postfix));
	77 break;
	78 case 'i':
	79 interval = strtonum(optarg, 1, UINT_MAX, &errstr…
	80 if (errstr != NULL)
	81 errx(1, "interval is %s: %s", errstr, op…
	82 break;
	83 case 'x':
	84 xflag = 1;
	85 break;
	86 default:
	87 usage();
	88 }
	89 }
	90 argc -= optind;
	91 argv += optind;
	92 if (argc != 1)
	93 usage();
	94
	95 if (sscanf(argv[0], "%d:%d:%d", &h, &m, &s) != 3)
	96 errx(2, "could not parse time in HH:MM:SS format");
	97 duration = h * 3600 + m * 60 + s;
	98
	99 if (xflag)
	100 xroot_loop(interval, prefix, postfix, duration);
	101 else
	102 print_loop(interval, prefix, postfix, duration);
	103
	104 return 0;
	105 }